When metal X is treated with sodium hydroxide, a white precipitate A is obtained, which is soluble in excess of NaOH to give soluble complex B. Compound A is soluble in dilute HCl to form compound C. The compound A when heated strongly gives, D which is used to extract metal . Identify X, A, B, C and D. Write suitable equations to support their identities.

A metal 'X' on treatment with NaOH forms a white precipitate (A) which is soluble in excess of NaOH to yield complex (B). (A) is soluble in HCI to produce (C). On strong heating (A) gives (D) from which the metal is extracted. Identity X, A, B, C, D and write the equation involved.

When metal 'M' is treated with NaOH , a white gelatinous precipitate 'X' is obtained , which is soluble in excess of NaOH . Compound 'X' when heated strongly gives an oxide which is used in chromatography as an adsorbent . The metal 'M' is -

A ketone A, which undergoes halform reaction, gives compound B on reduction B on heating with sulphuric acid gives compounds C, which forms mono-ozonide D.D on hydrolysis in the presence of zinc dust gives only acetaldehyde. Identify A, B and C. Write down the reaction involved.

An element A occupies group number 15 and period number 3, reacts with chlorine to give compound B. The compound Bon hydrolysis gives a dibasic acidC. The compound C on heating undergoes auto oxidation and reduction to give a tribasic acid D. Identify the element A, compound B,C and D. Write the reactions.

Primary alkyl halide C_(4)H_(9)Br (A) reacted with alcoholic KOH to give compound (B). Compound (B) is reacted with HBr to give (C) which is an isomer of (A). When (A) is reacted with sodium metal it gives compound (D), C_(8)H_(18) which is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (A) and write the equations for all the reactions.

When dilute HCI is added to a white substance (A), a colourless gas (B) is evolved. When the gas (B) is passed through clear lime water, a white precipitate ( C) is obtained. The precipitate dissolves when excess of the gas (B) is passed through the lime water. The residue obtained on heating the solid substance (A) is yellow when hot but white when cold. When the gas (B) is passed through red hot charcoal, another gas (D) is obtained. The gas (D) gets absorbed in arnmoniacal cuprous chloride solution . Identify (A), (B), (C) and (D) and give the relevant reactions.

The aqueous solution of a salt (A) is alkaline. When (A) is heated strongly, it swells up and melts to give a transparent bead. When the bead is heated with a sulphate salt (C), the bead becomes deep blue in colour. A white crystalline compound (D) is obtained when concentrated H_2SO_4 is added to a hot solution of (A). Identify (A), (B), (C) and (D) and give the reactions involved.

When a mixture of K_(2)Cr_(2)O_(7) and NH_(4)Cl is heated , a colourless gas in evloved which is neither combustiible nor a supporter of combusion . However , Mg continued to burn in it. When the gas (A) is reacted with calcium carbide in it . When the gas (A) is reacted with calcium carbide in electric furnace , a solid (B) is obtained . (B) undergoes slow hydrolysis forming an insoluble compound (C) and the solution of the compound (D). (D) truns Nessle's reagent brown. Identify (A) to (D) . Write the reactions involved.

When a compound A is heated, it produces a colourless gas and the residue obtained is dissolved in water to form the compound B. The compound C is formed when excess CO_2 is passed through aqueous solution of B. The compound C can be separated out in solid state from its solution. C in its solid state when heated forms the compound A. A is-